adapt tests to change in PHPUnit latest

Author: themsaid

src/Illuminate/Foundation/Testing/TestResponse.php

@@ -568,7 +568,7 @@ protected function jsonSearchStrings($key, $value)
     public function assertJsonStructure(array $structure = null, $responseData = null)
     {
         if (is_null($structure)) {
-            return $this->assertJson($this->json());
+            return $this->assertExactJson($this->json());
         }
 
         if (is_null($responseData)) {

tests/Foundation/FoundationTestResponseTest.php

@@ -154,7 +154,7 @@ public function testAssertJsonWithMixed()
 
         $resource = new JsonSerializableMixedResourcesStub;
 
-        $response->assertJson($resource->jsonSerialize());
+        $response->assertExactJson($resource->jsonSerialize());
     }
 
     public function testAssertJsonFragment()